Re: [Iptel] CPL as a standard for distinctive ringing

[[e-mail]]

Probably subject of my mail was misleading. My intension was to mean CPL as
a standard way of scripting distinct ring plan at proxy server.

Its very much true that distinctive ringing has to be implemented at
end-points - which precisely means playing the ring tone specified in the
alert-info header in INVITE.

The hypothetical extension (draft-ietf-iptel-cpl-08: chapter 12.10) can be
used by proxy administrators to script a distinct ring plan for a
subscriber/ end-point. I was wondering how long this will be kept as a
"hypothetical" extension in the draft? The suggested "ring" node can be
included in the standard CPL schema just like other nodes e.g. "mail"
non-signalling node. In that case, proxy server developers will provide CPL
as a standard way of scripting distinct ring plan for a subscriber.



                                                                           
             Jonathan Lennox                                               
             <[e-mail]                                             
             ia.edu>                                                    To 
                                       [e-mail]                     
             02/05/04 01:15 AM                                          cc 
                                       [e-mail],                     
                                       [e-mail]            
                                                                   Subject 
                                       Re: [Iptel] CPL as a standard for   
                                       distinctive ringing                 
                                                                           
                                                                           
                                                                           
                                                                           
                                                                           
                                                                           




On Wednesday, February 4 2004, "[e-mail]" wrote to "[e-mail],
[e-mail]" saying:

> This is regarding the suggested hypothetical extension to CPL
> (draft-ietf-iptel-cpl-08: chapter 12.10) for distinctive ringing.
>
> This extension was originally proposed in the 03 version of the draft.
> Since then it has been kept as a "hypothetical" extension and _not_ as a
> "standard" action node in 5 more later versions including the latest 08
> version.
>
> I would like to know the possibility/ acceptance of "ring"
> (draft-ietf-iptel-cpl-08: chapter 12.10) node coming in the standard CPL
> schema in future versions of the draft.
>
> Also response from SIP proxy developers, who are following the suggested
> extension for their distinctive ringing implementation, will be
> appreciated.

CPL is intended as a language for controlling SIP proxy servers.  There's
no
(standardized) way to implement distinctive ring in a proxy server; it
needs
to be done by user agents.

You might want to take a look at Xiaotao Wu's LESS, the Language for End
System Services.  It's an extension of CPL designed for end-system control
of this sort.

--
Jonathan Lennox
[e-mail]



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